package Exmaple09;

public class Example09 {
    private static final int TIMES = 100000;
    public static void main(String[] args) {
        Example09.testString();
        Example09.testStringBuffer();
        Example09.testStringBuilder();
    }
    //String时间效率测试
    public static void testString(){
        long startTime = System.currentTimeMillis();
        String str = "";
        for (int i = 0; i < TIMES; i++){
            str += "test";
        }
        long endTime = System.currentTimeMillis();
        System.out.println("String test usedtime:"+(endTime - startTime));
    }
    // StringBuffer时间效率测试(线程安全)
    public static void testStringBuffer(){
        long startTime = System.currentTimeMillis();
        StringBuffer str = new StringBuffer();
        for (int i = 0; i < TIMES; i++);{
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuffer test usedtime:"+(endTime - startTime));
    }
    // StringBuilder时间效率测试(非线程安全)
    public static void testStringBuilder(){
        long startTime = System.currentTimeMillis();
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < TIMES; i++){
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuilder test usedtime:"+(endTime - startTime));
    }
}
